In order to obtain the motion law,liquid compression state and development & evolution law of cavitation after the water-entry of projectile,a 3-D fluid-solid coupling(FSI)numerical model involving air,projectile and water is es-tablished.In the condition of the initial velocity of the projectile is 500 m/s,750 m/s,1 000 m/s,1250 m/s and 1 500 m/s re-spectively,the numerical simulation is carried out,and then the change law of velocity,acceleration,surface pressure and fluid density in the thin layer around the projectile during high-speed projectile water entry were obtained.The results show that the acceleration of the projectile and the peak pressure of the fluid in the thin layer around the projectile increased with the increase of the initial velocity of the projectile,but the velocity of the projectile decreased rapidly during the process of water-entry.When the projectile entered water at high speed,the pressure of surface liquid increased sharply and the fluid density in the thin layer around the projectile increased accordingly,the surface cavitation of the projectile is not easy to get closed.
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